.223 to be used in 5.56x45mm AR-15

This is a discussion on .223 to be used in 5.56x45mm AR-15 within the Defensive Rifles & Shotgun Discussion forums, part of the Related Topics category; I'm certain this has been asked on this forum. I did a quick search and didn't find anything quickly. I also googled the subject and ...

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Thread: .223 to be used in 5.56x45mm AR-15

  1. #1
    Distinguished Member Array RKM's Avatar
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    .223 to be used in 5.56x45mm AR-15

    I'm certain this has been asked on this forum. I did a quick search and didn't find anything quickly. I also googled the subject and found answers. I'd just like to double check.

    My M&P has 5.56 stamped on the barrel. I can't find any "self defense" type of 5.56mm but I can find load of it in .223 .. I read that 5.56 guns can fire both 5.56 and .223 and that .223 gun should only fire .223 ..

    I know I'll likely never need defense ammo for my AR, just like I'll likely never need JHP's for my pistols either. But it's comforting to have. I know 5.56/.223 isn't ask effect as 7.62's/.308's, but I figure with the best defense ammo, it'll be enough.

    I hear this is the best in .223, Ok to use in my 5.56 AR?


    Any other options?

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  3. #2
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    Array MattInFla's Avatar
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    It is fine to shoot normally dimensioned .223 Remington in a 5.56 x 45 chamber.

    Matt
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    Distinguished Member Array RKM's Avatar
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    Thanks!

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    Distinguished Member Array Jason Storm's Avatar
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    You should have no problem. Although I keep .223 for self-defense, I shoot both .223 and 5.56 for practice and the rifle works fine with either caliber.

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    Array buckeye .45's Avatar
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    Your good. Its my understanding that the issue has mostly to do with the pressure of the rounds, with 5.56 being the higher pressure round. So in say a .223 chambered bolt action 5.56 is not a smart idea. But going the other way round is fine.

    I believe the cartridges also have a slightly different angle up around the top, but I don't know for sure.
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    Distinguished Member Array RKM's Avatar
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    Thanks guys. reason I asked, like I said, it's hard to find self defense HP's in 5.56mm. I'd prefer them in 5.56mm due to the higher pressure, but I guess I'll have to deal with .223's.

    Anybody use Cor-Bon DPX in .223 53 or 62 grain? I hear heavier grain is better for 16" or less barrels. My M&P is 16" 1/9. I have Cor-Bon DPX in .45 ACP. I haven't done any personal tests but from what I've seen the DPX rounds are excellent, which is why I bought them. And I know 5.56/.223 doesn't have the greatest stopping power, but I figured using a DPX round should change that. Thoughts?

  8. #7
    Distinguished Member Array SubNine's Avatar
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    The 1/9 twist barrel in the M&P15 should be able to accurately handle 55-62 grain bullets. Anything more than that and I think you'd want a 1/7 twist barrel. Someone correct me if I'm wrong.

    I miss my M&P15
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    Senior Member Array Ring's Avatar
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    Quote Originally Posted by SubNine View Post
    The 1/9 twist barrel in the M&P15 should be able to accurately handle 55-62 grain bullets. Anything more than that and I think you'd want a 1/7 twist barrel. Someone correct me if I'm wrong.

    I miss my M&P15
    i was just shooting 75gr at 500+ y and hitting a 8" target...

    i have even shot 80gr out of a 1/9

  10. #9
    Distinguished Member Array SubNine's Avatar
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    Quote Originally Posted by Ring View Post
    i was just shooting 75gr at 500+ y and hitting a 8" target...

    i have even shot 80gr out of a 1/9
    Ah okay thats good to know. I've only shot 55 grain out of the two M&Ps I've owned. I guess the 1/9 is more versatile than I was led to believe.
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    Distinguished Member Array MinistrMalic's Avatar
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    1/9 should be fine for that range...many will say that the 1/7 twist barrel is unnecessary. While you can't overstabilize a bullet, the 1/7 has a shorter operational life than a 1/9. You can shoot about any .223 out of a 1/9 and it will fly great.
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  12. #11
    Senior Member Array Shadowsbane's Avatar
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    There is a lot of variance between the actual twist rate of some companies barrels from what I understand. This translates to some people having no issues and others having a fair number.
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